The primary alloy base materials for Hastelloy C276 include metals such as nickel, molybdenum and chromium. In addition to these three metals, Hastelloy C276 fasteners also have tungsten added. It is well known that the addition of tungsten to superalloys can improve the corrosion resistance of alloys in various harsh environments. Hastelloy C-276 alloy has excellent resistance to a variety of chemical process environments, including strong oxidizing agents such as ferric and cupric chlorides, hot fouling media (organic and inorganic), chlorine, formic and acetic acid, acetic anhydride , seawater and brine solutions.